Study to Evaluate the Safety and Efficacy of OR3O™ Dual Mobility System vs. Conventional Single Bearing Design Total Hip System

Inclusion Criteria: * Subject is a suitable candidate for implanting the OR3O™ Dual Mobility System or single-bearing design Total Hip System in primary total hip replacement in the Investigator's judgement. * Subject is skeletally mature in the Investigator's judgement. * Subject is 18 - 80 years old (inclusive). * Subject is receiving total hip replacement for the first time on the affected hip. * Subject has any of the following conditions: * Advanced degeneration of the hip joint as a result of degenerative, post-traumatic, or rheumatoid arthritis(RA); * Fracture or avascular necrosis of the femoral head; * All forms of osteoarthritis(OA); * Patients with hips at risk of dislocation; * Femoral neck fracture or proximal hip joint fracture. * Subject provides written informed consent for study participation using an Ethical Committee (EC) approved consent form before any study procedures are performed, including pre-operative data review and/or collection of data on electronic Case Report Forms (eCRFs). * Subject is willing and able to participate in required follow-up visits and is able to complete study activities. * Subjects with preoperative HHS ≤ 79 (fair or worse category). Exclusion Criteria: * Subject has conditions that would eliminate or tend to eliminate adequate implant support or prevent the use of an appropriately-sized implant, e.g.: * blood supply limitations; * insufficient quantity or quality of bone support, e.g., osteoporosis, metaboli…